1 Corinthians 10:24

10:24 Do not seek your own good, but the good of the other person.

1 Corinthians 14:4

14:4 The one who speaks in a tongue builds himself up, ¹  but the one who prophesies builds up the church.

[14:4]  ¹ sn The Greek term builds (himself) up does not necessarily bear positive connotations in this context.